在IT行业中,Web开发是至关重要的领域,而`jsp`(JavaServer Pages)和`servlet`是Java Web开发中的核心技术,常用于构建动态网站。本项目以"jsp+servlet实现增删改查"为主题,旨在利用这两者实现CRUD(Create、Read、Update、Delete)操作,这是任何数据管理系统的基石。 `CRUD`是数据库操作的基本动作。创建(Create)指的是向数据库添加新记录;读取(Read)涉及查询和显示数据;更新(Update)允许修改现有记录;删除(Delete)则涉及从数据库中移除记录。在`jsp`和`servlet`中,这些操作通常通过HTTP请求来触发,服务器端的`servlet`处理请求,执行相应的数据库操作,然后将结果返回给`jsp`页面进行展示。 在该项目中,使用了`ajax`技术来进行异步验证。`Ajax`(Asynchronous JavaScript and XML)允许前端与后台通信,无需刷新整个页面,提高了用户体验。例如,在注册或登录时,可以实时检查用户名是否已存在,减少用户等待时间。 数据库密码加密是确保数据安全的重要环节。在用户注册时,原始密码不应直接存储在数据库中,而是应该进行加密。常见的加密方法有MD5、SHA系列算法,或者使用更安全的bcrypt、scrypt等。 为了解决中文乱码问题,项目可能使用了过滤器(Filter)。在HTTP请求和响应过程中,过滤器可以拦截并处理字符编码,确保中文字符正确显示。例如,设置请求和响应的编码格式为UTF-8,避免中文乱码的出现。 分页功能是大数据量展示的常用手段,它可以帮助用户逐步加载和浏览大量内容,提高网页加载速度。实现分页通常需要在后端计算每页的记录数和页码,然后传递给前端显示相应的数据。 导出Excel功能提供了数据导出的便利性。用户可以将查询结果以Excel表格的形式下载,方便进一步分析或离线查看。这通常通过Apache POI库来实现,该库允许Java程序创建、修改和读取Microsoft Office格式的文件,包括Excel。 这个项目涵盖了Web开发中的一些核心实践,包括前后端交互、数据库操作、数据安全、用户体验优化以及数据导出等,是一个全面的Web应用示例。尽管页面美观度可能不足,但其功能性得到了充分的体现,对于学习和理解Java Web开发具有很高的价值。
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